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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c329d3279e7ec1da510b344fd3ac7098f78238f2552239d5106ad94e23121acf' 
  AND token = 'bGnEK8F5Y2CNASq7xWQXazpUqcotgrJJOx4IR+kM6l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}